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Re:Modern SQL: With – Organize Complex Queries by masklinn on Tuesday November 24, 2015 @09:22AM (#10620803)
> It looks like Postgres can do it [1] with its JSON capabilities

Postgres could do it long before its JSON capabilities, array_agg was added in Postgres 8.4 (2009) and hstore in 8.3 (2008)

Re:Modern SQL: With – Organize Complex Queries by colanderman on Tuesday November 24, 2015 @09:28AM (#10620848)
Also, ARRAY(), since 7.4 in 2003.